Module '''acpi-cpufreq''' and at least one of CPU governors ('''cpufreq_ondemand''', '''cpufreq_conservative''', etc.) are required. More informations on [[CPU Frequency Scaling]].

Module '''acpi-cpufreq''' and at least one of CPU governors ('''cpufreq_ondemand''', '''cpufreq_conservative''', etc.) are required. More informations on [[CPU Frequency Scaling]].

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{{Note|i915 module parameter i915_enable_rc6 can give up to 2 hours of additional battery life. However it is considered unstable and might cause crashes and graphical glitches. Add '''i915.i915_enable_rc6&#61;1''' to your kernel line in bootloader to try it.}}

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{{Note|<s>i915 module parameter i915_enable_rc6 can give up to 2 hours of additional battery life. However it is considered unstable and might cause crashes and graphical glitches. Add '''i915.i915_enable_rc6&#61;1''' to your kernel line in bootloader to try it.</s>}}

{{Note|With laptop-mode-tools, tune from powertop2 and i915_enable_rc6 parameter I was able to get about 5:30h of estimated battery life.}}

{{Note|With laptop-mode-tools, tune from powertop2 and i915_enable_rc6 parameter I was able to get about 5:30h of estimated battery life.}}

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{{Note|Keep in mind that the powertop "good/bad" parameters will not survive a reboot. [http://intellinuxgraphics.org/2012.07.html As of 3.4.x] rc6 is enabled by default for Ivy Bridge and Sandy Bridge processors. The default (marked -1) is equivalent of i915_enable_rc6&#61;3 which enables rc6 and rc6p. An additional, lower power state can also be enabled by using i915_enable_rc6&#61;7, though this has been reported to sometimes come at the cost of stability. Also, as of [http://intellinuxgraphics.org/2011Q4.html 2011Q4] the i915 module in Sandy Bridge and Ivy Bridge also have framebuffer compression enabled by default.}}

Graphics

Brightness

Controlling brightness with Fn+F2 and Fn+F3 buttons works in Gnome 3, did not test in other DEs.

Touchpad

Works with xf86-input-synaptics package. Could not get it to switch off while double tapped in top-left corner, like it worked in Suse Linux Enterprise Desktop, which was factory OS. Tested tapping, two- and three-finger tapping and two-finger scrolling.

SD cards tested and working. Memory Stick cards do not work, despite having module jmb38x_ms loaded. Dmesg does not show any info about Memory Stick card being inserted. With 3.4.7 kernel, Memory Stick card works as intended.

Function keys

Module hp-wmi is likely to be required for the keys to work. In Gnome 3 every Fn+F* key works. Fn-F6 key requires gnome-power-manager installed.
Keys above numeric keypad are also recognized. The Web key has a XF86HomePage symbol (opens home page) and Wi-Fi key has NoSymbol and does nothing.

Camera

Works with uvcvideo module.

Power

Module acpi-cpufreq and at least one of CPU governors (cpufreq_ondemand, cpufreq_conservative, etc.) are required. More informations on CPU Frequency Scaling.

Note:i915 module parameter i915_enable_rc6 can give up to 2 hours of additional battery life. However it is considered unstable and might cause crashes and graphical glitches. Add i915.i915_enable_rc6=1 to your kernel line in bootloader to try it.

Note: With laptop-mode-tools, tune from powertop2 and i915_enable_rc6 parameter I was able to get about 5:30h of estimated battery life.

Note: Keep in mind that the powertop "good/bad" parameters will not survive a reboot. As of 3.4.x rc6 is enabled by default for Ivy Bridge and Sandy Bridge processors. The default (marked -1) is equivalent of i915_enable_rc6=3 which enables rc6 and rc6p. An additional, lower power state can also be enabled by using i915_enable_rc6=7, though this has been reported to sometimes come at the cost of stability. Also, as of 2011Q4 the i915 module in Sandy Bridge and Ivy Bridge also have framebuffer compression enabled by default.

Suspend/hibernation

Both suspend and hibernation work with pm-utils and kernel backend.

Sensors

Lm-sensors shows one acpitz-virtual device with 4 working temperature readings and coretemp-isa device which has one sensor for each CPU core.
It does not show any info about fans RPMs.